U.S. patent number 7,106,257 [Application Number 10/998,633] was granted by the patent office on 2006-09-12 for dual-band inverted-f antenna.
This patent grant is currently assigned to Arcadyan Technology Corporation. Invention is credited to I-Ru Liu, Hong-Kun Tyan.
United States Patent |
7,106,257 |
Liu , et al. |
September 12, 2006 |
Dual-band inverted-F antenna
Abstract
A dual-band inverted-F antenna includes a ground substrate, a
radiating body, a first ground part, a second ground part and a
feed point. The ground substrate has a ground surface. The
radiating body at least has a first side, a second side, a third
side, and a split. The first side and the second side form a first
included angle, while the second side and the third side form a
second included angle. The third side is disposed opposite to the
first side, and the split is positioned from the first side to the
second side. The first ground part is extended along the third side
with a first distance away from the second side. The second ground
part is extended along the second side with a second distance away
from the first side. A third distance is set between the feed point
and the second side.
Inventors: |
Liu; I-Ru (Taipei,
TW), Tyan; Hong-Kun (Taoyuan County, TW) |
Assignee: |
Arcadyan Technology Corporation
(Hsinchu, TW)
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Family
ID: |
35424612 |
Appl.
No.: |
10/998,633 |
Filed: |
November 30, 2004 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20050264456 A1 |
Dec 1, 2005 |
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Foreign Application Priority Data
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Jun 1, 2004 [TW] |
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93115712 A |
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Current U.S.
Class: |
343/700MS;
343/702 |
Current CPC
Class: |
H01Q
1/22 (20130101); H01Q 9/0421 (20130101); H01Q
5/371 (20150115); H01Q 5/50 (20150115) |
Current International
Class: |
H01Q
1/38 (20060101); H01Q 1/24 (20060101) |
Field of
Search: |
;343/702,700MS |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Dinh; Trinh Vo
Attorney, Agent or Firm: Bacon & Thomas, PLLC
Claims
What is claimed is:
1. A dual-band inverted-F antenna, comprising: a ground substrate,
which has a ground surface and a through hole; a radiating body,
which is a flat plate and at least has a first side, a second side,
a third side, and a split, wherein the first side and the second
side form a first included angle, while the second side and the
third side form a second included angle, the third side is disposed
opposite to the first side, and the split is positioned from the
first side to the second side; a first ground part, which is
extended along the third side with a first distance away from the
second side, and electrically connects to the ground surface; a
second ground part, which is sheet-shaped, is extended along the
second side with a second distance away from the first side, and
electrically connects to the ground surface; and a feed point
passing through the through hole and electrically connected, to the
first side of the radiating body, wherein a third distance is set
between the feed point and the second side.
2. The dual-band inverted-F antenna of claim 1, wherein the ground
surface is made of conductive material.
3. The dual-band inverted-F antenna of claim 1, wherein the
radiating body, the first ground part and the second ground part
are integrally formed.
4. The dual-band inverted-F antenna of claim 3, further comprising:
a foam gel, which is disposed between the radiating body and the
ground substrate.
5. The dual-band inverted-F antenna of claim 1, wherein the split
is L-shaped.
6. The dual-band inverted-F antenna of claim 1, wherein the sum of
the first included angle and the second included angle are 180
degrees.
7. The dual-band inverted-F antenna of claim 1, wherein the first
ground part is a wire.
8. The dual-band inverted-F antenna of claim 1, wherein the first
ground part is a sheet-shaped conductor.
9. The dual-band inverted-F antenna of claim 1, wherein one end of
the second ground part opposite to the second side further
comprises a convex portion.
10. The dual-band inverted-F antenna of claim 1, wherein one end of
the second ground part opposite the second side further comprises a
concave portion.
11. The dual-band inverted-F antenna of claim 1, wherein the second
distance is greater than or equal to a half of a length of the
second side.
12. The dual-band inverted-F antenna of claim 1, wherein the first
distance is between to 3/5 time of the difference between the
second distance and a length of the second side.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
This Non-provisional application claims priority under 35 U.S.C.
.sctn.119(a) on Patent Application No. 093115712 filed in Taiwan,
Republic of China on Jun. 1, 2004, the entire contents of which are
hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a dual-band inverted-F antenna and, in
particular, to the dual-band inverted-F antenna, which has reduced
dimensions and increased operation bandwidth.
2. Related Art
Antenna is a key element for transmitting and receiving the
magnetic wave in the wireless communication system. Without the
antenna, the wireless system could not transmit and receive
information. As a result, the antenna plays an important role in
the wireless communication. Choosing a proper antenna not only is
helpful to match up with the outward appearance of products, but
also can improve the signal quality of the transmission or
reception. Moreover, a proper antenna also can reduce the
production cost. According to different product application, the
antenna can be designed in various ways and made of various
materials. Besides, the usable band is different in every country.
Therefore, there are lots of points should be considerated. At
present time, IEEE 802.11, DECT, and 802.15.1 (Bluetooth) are
common standards of the usable bands. Among them, the usable band
for DECT is 1.88 GHz, and that for Bluetooth is 2.4 GHz. The 802.11
includes 802.11a and 802.11b/g standards, which has the band of 5
GHz and 2.4 GHz respectively.
In the prior art, the antenna body is made of a coaxial cable or a
printed circuit board. Because of the material and the structure of
the conventional antenna, it is high cost to produce the antenna.
In addition, the dimension of the conventional antenna is not
easily minimized, and the performance thereof is hardly
controlled.
Recently, dual-band inverted-F antennas have been developed. It's
very common to be applied in the wireless communication system,
since its small dimension, simple structure, and good gains.
According to FIG. 1, the conventional dual-band inverted-F antenna
1 for receiving or transmitting signals has a radiation patch 11, a
shorting pin 12, a feed point 13, and a ground plate 14. In this
case, the shorting pin 12 is disposed on one side of the radiation
patch 11 and the radiation patch 11 electrically connects to the
ground plate 14. The feed point 13 connects a feed node of the
radiation patch 11 to the ground plate 14. Thus, the inverted-F
antenna 1 is obtained.
For the inverted-F antenna to receive or transmit the signals in
some bands, a current should be fed in from the feed point so as to
induce resonance in the radiation patch 11. Utilizing the generated
band according to resonance, the antenna can receive or transmit
signals of specific band. Additionally, if another radiation patch
(not shown) is disposed on the radiation patch 11 through a
connecting portion, the inverted-F antenna could be applied to two
different bands.
As described above, the band of the conventional inverted-F antenna
only covers some ranges. Consequently, different countries have
different limitations in the usable bands. The inverted-F antenna
products cannot be applied into different country areas. In
additional, it's hard to minimize the dimension of the antenna
applied for the smaller electronic products.
Therefore, it is an important subjective to minimize the dimension
of the inverted-F antenna, increase the effective bandwidth of the
inverted-F antenna, and manufacture the inverted-F antenna
products, which can meet needs of more countries.
SUMMARY OF THE INVENTION
In view of the foregoing, this invention is to provide a dual-band
inverted-F antenna, which is minimized in dimension, is capable of
increasing the effective bandwidth thereof, and is capable of being
applied for two different bands.
To achieve the above, a dual-band inverted-F antenna includes a
ground substrate, a radiating body, a first ground part, a second
ground part and a feed point. The ground substrate has a ground
surface. The radiating body is a flat plate and at least has a
first side, a second side, a third side, and a split. The first
side and the second side form a first included angle, while the
second side and the third side form a second included angle. The
third side is disposed opposite to the first side, and the split is
positioned from the first side to the second side. The first ground
part is extended along the third side with a first distance away
from the second side. The second ground part is extended along the
second side with a second distance away from the first side. A
third distance is provided between the feed point and the second
side.
The invention further provides a radiating assembly for dual-band
inverted-F antenna. The radiating assembly includes a radiating
body, a first ground part, and a second ground part. The radiating
body is a flat plate and at least has a first side, a second side,
a third side, and a split. In this case, the first side and the
second side form a first included angle, and the second side and
the third side form a second included angle. The third side is
disposed opposite to the first side, and the split is positioned
from the first side to the second side. The first ground part is
extended along the third side with a first distance away from the
second side. The second ground part is sheet-shaped, and is
extended along the second side with a second distance away from the
first side.
As mentioned above, the dual-band inverted-F antenna according to
the invention uses the split to achieve the effect of dual-band.
Moreover, the ground part is disposed at a specified position,
which generates an additional path for the current flow. Thus, the
total current pathways become more complex. As a result, the
dimension of the antenna can be minimized and the bandwidth of the
antenna can be increased.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will become more fully understood from the detailed
description given herein below illustrations only, and thus is not
limitative of the present invention, and wherein:
FIG. 1 is a schematic view of the conventional inverted-F
antenna;
FIG. 2 is a schematic view of a radiating assembly for the
dual-band inverted-F antenna according to a preferred embodiment of
the invention;
FIG. 3 is another schematic view of a radiating assembly for the
dual-band inverted-F antenna according to a preferred embodiment of
the invention;
FIGS. 4A to 4D are schematic views of a convex portion and a
concave portion of a second ground part in a radiating assembly for
dual-band inverted-F antenna according to a preferred embodiment of
the invention; and
FIG. 5 is a schematic view of a dual-band inverted-F antenna
according to a preferred embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The dual-band inverted-F antenna and the radiating assembly thereof
according to preferred embodiments of the invention will be
described herein below with reference to the accompanying drawings,
wherein the same reference numbers refer to the same elements.
First of all, according to FIG. 2 to FIG. 4D, a radiating assembly
of the preferred embodiment of the invention is described
below.
Referring to FIG. 2, the radiating assembly for the dual-band
inverted-F according to a preferred embodiment of the invention
includes a radiating body 21, a first ground part 22, and a second
ground part 23. In the current embodiment, the radiating body 21 is
a flat plate and at least has a first side 211, a second side 212,
and a third side 213. The first side 211 and the second side 212
form a first included angle .theta.21. The second side 212 and the
third side 213 form a second included angle .theta.22. Wherein, the
sum of the first included angle .theta.21 and the second included
angle .theta.22 are 180 degrees. In the embodiment, the first
included angle .theta.21 and the second included angle .theta.22
are all right angles. Besides, the third side 213 is disposed
opposite to the first side 211. A split 214 is positioned from the
first side 211 to the second side 212. In the embodiment, the split
214 is L-shaped.
The first ground part 22 is extended along the third side 213 with
a first distance d21 away from the second side 212. The second
ground part 23 is sheet-shaped and extended along the second side
212 with a second distance d22 away from the first side 211. In
this case, the second distance d22 is greater than or equal to a
half of the length of the second side 212. The first distance d21
is between to 3/5 time of the difference of the second distance d22
and the length of the second side 212. It is preferred for the
distance within a half of the difference between the second
distance d22 and the length of the second side 212.
The first ground part 22 could be a wire; otherwise, also it could
be a sheet-shaped conductor 22' as shown in FIG. 3. As shown in
FIGS. 4A to 4D, one end of the second ground part 23 opposite to
the second side 212 at least has a convex portion (sharp-shaped or
bump-like) 231 or a concave portion 232. Furthermore, the radiating
body 21, the first ground part 22 and the second ground part 23 are
integrally formed to be a dual-band inverted-F antenna radiating
assembly 2.
Secondly, according to FIG. 5, the dual-band inverted-F antenna of
the preferred embodiment of the invention is disclosed.
As shown in FIG. 5, a dual-band inverted-F antenna 4 of a preferred
embodiment of the invention includes a ground substrate 41, a
radiating body 42, a first ground part 43, a second ground part 44
and a feed point 45.
In the current embodiment, the ground substrate 41 has a ground
surface 411. The ground surface 411 is made of conductive material
and is for electrically connecting to the radiating assembly. The
radiating body 42 is a flat plate and at least has a first side
421, a second side 422, and a third side 423. The first side 421
and the second side 422 form a first included angle .theta.41. The
second side 422 and the third side 423 form a second included angle
.theta.42. Wherein, the sum of the first included angle .theta.41
and the second included angle .theta.42 are 180 degrees. In the
embodiment, first included angle .theta.41 and the second included
angle .theta.42 are all right angles. Besides, the third side 423
is disposed opposite to the first side 421. A split 424 is
positioned from the first side 421 to the second side 422. In the
embodiment, the split 424 is L-shaped.
The first ground part 43 is extended along the third side 423 with
a first distance d41 away from the second side 422. The first
ground part 43 electrically connects to the ground surface 411. The
second ground part 44 is sheet-shaped and extended along the second
side 422 with a second distance d42 away from the first side 421.
The second ground part 44 electrically connects to the ground
surface 411. The feed point 45 electrically connects to the first
side 421 and a third distance d43 is between the feed point 45 and
the second side 422. In this case, the second distance d42 is
greater than or equal to a half of the length of the second side
422. The first distance d41 is between to 3/5 time of the
difference of the second distance d42 and the length of the second
side 422. Moreover, the first distance d41 is proper within a half
of the difference of the length of the second side 422 and the
second distance d42. In the current embodiment, the first distance
d41 is 1.975 mm, and the second distance d42 is 6 mm. However, in
real manufacturing processes, the error tolerance of these
distances is .+-.10% by manual or by machine.
The first ground part 43 could be a wire; otherwise, also it could
be a sheet-shaped conductor 22' (shown in FIG. 3). As shown in
FIGS. 4A to 4D and FIG. 5, the end of the second ground part 44
opposite to the second side 422 at least has a convex portion
(sharp-shaped or bump-like) 231 or a concave portion 232. The
convex portion 231 or the concave portion 232 is embedded in the
ground part 411 and forms electrically connection. As a result, the
structure of the dual-band inverted antenna 4 will be stronger.
Besides, a foam gel could be disposed in the space between the
radiating body 42 and the ground substrate 41, so as to avoid the
electrical connecting to the ground surface 411 except through the
first ground part 43 and the second ground part 44. In the current
embodiment, the feed point 45 passes through the hole 46 on the
ground substrate 41 and electrically connects with the first side
421. The feed point 45 can be used to transmit current signals.
In the embodiment, the ground substrate 41, the radiating body 42,
the first ground part 43, the second ground part 44 and feed points
45 are integrally formed to construct a dual-band inverted-F
antenna 4.
As mentioned above, the dual-band inverted-F antenna 4 of the
invention takes the advantage of the split 424 to achieve the
effect of dual bands. On the other hand, there are two ground parts
(the first ground part 43 and the second ground part 44) of the
antenna, which make the pathways on the antenna 4 more complex.
When the electrical signals passed by the feed points 45, the
radiating body 42 possesses two different resonance points. As a
result, the antenna gets a broader bandwidth of dual-band, which
could be applied in IEEE 802.11a, 802.11b/g, Bluetooth, DECT, or
other bands. Furthermore, owing to the two ground parts of the
dual-band inverted-F antenna 4 of the invention, the dimension of
the dual-band inverted-F antenna can be reduced and the effective
bandwidth can be increased for applying to smaller electronic
product.
Although the invention has been described with reference to
specific embodiments, this description is not meant to be construed
in a limiting sense. Various modifications of the disclosed
embodiments, as well as alternative embodiments, will be apparent
to persons skilled in the art. It is, therefore, contemplated that
the appended claims will cover all modifications that fall within
the true scope of the invention.
* * * * *